<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="addDialogVisible = true">添加角色</el-button>
        </el-col>
      </el-row>

      <el-table :data="rolesList" border stripe>
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row
              :class="['bdbottom', index1 === 0 ? 'bdtop' : '', 'vcenter']"
              v-for="(item1, index1) in scope.row.children"
              :key="item1.id">
              <!-- 渲染一级权限 -->
              <el-col :span="6">
                <el-tag
                  :closable="true"
                  @close="removeRightById(scope.row, item1.id)">
                  {{item1.authName}}
                </el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="18">
                <el-row
                  :class="[index2 === 0 ? '' : 'bdtop', 'vcenter']"
                  v-for="(item2, index2) in item1.children"
                  :key="item2.id">
                  <el-col :span="6">
                    <el-tag
                      type="success"
                      :closable="true"
                      @close="removeRightById(scope.row, item2.id)">
                      {{item2.authName}}
                    </el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag
                      type="warning"
                      :class="[index3 === 0 ? '' : 'bdtop']"
                      v-for="(item3, index3) in item2.children"
                      :key="item3.id"
                      :closable="true"
                      @close="removeRightById(scope.row, item3.id)">
                      {{item3.authName}}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button size="mini" type="primary" icon="el-icon-search" @click="showEditDialog(scope.row.id)">编辑</el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeUserById(scope.row.id)">删除</el-button>
            <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <el-dialog
      title="添加角色"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed">
      <el-form
        :model="addForm"
        :rules="editFormRules"
        ref="addFormRef"
        label-width="80px">
        <el-form-item label="角色名称" prop="roleName">
          <el-input v-model="addForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" prop="roleDesc">
          <el-input v-model="addForm.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addRole">确 定</el-button>
      </span>
    </el-dialog>

    <el-dialog
      title="修改用户"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed">
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="80px">
        <el-form-item label="角色名称" prop="roleName">
          <el-input v-model="editForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" prop="roleDesc">
          <el-input v-model="editForm.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editRoleInfo">确 定</el-button>
      </span>
    </el-dialog>

    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed">
      <!-- 树型组件 -->
      <el-tree
        :data="rightsList"
        :props="treeProps"
        :show-checkbox="true"
        node-key="id"
        :default-expand-all="true"
        :default-checked-keys="defaultKeys"
        ref="treeRef">

      </el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'Roles',
  data () {
    return {
      rolesList: [],
      addDialogVisible: false,
      addForm: {
        roleName: '',
        roleDesc: ''
      },
      editDialogVisible: false,
      editForm: {},
      editFormRules: {
        roleName: [
          { required: true, message: '请输入角色名称', trigger: 'blur' }
        ],
        roleDesc: [
          { required: false, message: '请输入角色描述', trigger: 'blur' }
        ]
      },
      setRightDialogVisible: false,
      // 所有权限的数据
      rightsList: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的节点ID值数组
      defaultKeys: [],
      roleId: ''
    }
  },
  created () {
    this.getRolesList()
  },
  methods: {
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')

      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败! ')
      }

      this.rolesList = res.data
    },
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    addRole () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return
        }
        const { data: res } = await this.$http.post('roles', this.addForm)

        if (res.meta.status !== 201) {
          this.$message.error('添加角色失败! ')
        }
        this.$message.success('添加角色成功! ')
        // 隐藏添加用户对话框
        this.addDialogVisible = false
        this.getRolesList()
      })
    },
    async removeRightById (role, rightId) {
      const confirmResult = await this.$confirm('此操作将永久删除该权限,是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除! ')
      }

      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)

      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败! ')
      }

      // 重新获取权限列表会导致页面刷新
      // this.getRolesList()
      // 推荐采取用重新赋值代替
      role.children = res.data
    },
    async showEditDialog (id) {
      const { data: res } = await this.$http.get('roles/' + id)

      if (res.meta.status !== 200) {
        return this.$message.error('查询用户信息失败! ')
      }

      this.editForm = res.data
      this.editDialogVisible = true
    },
    async removeUserById (id) {
      const confirmResult = await this.$confirm('永久删除该角色,是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('已经取消删除')
      }
      const { data: res } = await this.$http.delete('roles/' + id)

      if (res.meta.status !== 200) {
        return this.$message.error('删除角色失败! ')
      }

      this.$message.success('删除角色成功! ')
      this.getRolesList()
    },
    editRoleInfo () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) {
          return
        }
        // 通过验证发起修改用户请求
        const { data: res } = await this.$http.put('roles/' + this.editForm.roleId,
          {
            roleName: this.editForm.roleName,
            roleDesc: this.editForm.roleDesc
          })

        if (res.meta.status !== 200) {
          return this.$message.error('更新角色信息失败! ')
        }

        // 关闭对话框
        this.editDialogVisible = false
        // 刷新数据列表
        this.getRolesList()
        // 提示修改成功
        this.$message.success('更新角色信息成功! ')
      })
    },
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    async showSetRightDialog (role) {
      this.roleId = role.id
      // 获取所有权限的数据
      const { data: res } = await this.$http.get('rights/tree')

      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败! ')
      }

      this.rightsList = res.data

      this.getLeafKeys(role, this.defaultKeys)

      this.setRightDialogVisible = true
    },
    // 通过递归的形式,获取角色下所有三级权限的ID,并保存到 defaultKeys 数组中
    getLeafKeys(node, arr) {
      // 如果当前 node 节点不包含 children 属性,则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }

      node.children.forEach(item => this.getLeafKeys(item, arr))
    },
    setRightDialogClosed () {
      this.defaultKeys = []
    },
    // 点击为角色分配权限
    async allotRights () {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]

      const idStr = keys.join(',')

      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })

      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败! ')
      }

      this.$message.success('分配权限成功! ')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}
.bdtop {
  border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee;
}
.vcenter {
  display: flex;
  align-items: center;
}
</style>
